professor is a bachelor of science course only or not
No , I am afraid that by doing only Bachelor in Science you can not become professor in any university or Institute.
For becoming a professor One must have a Masters degree in that fied .Hence for you , you need to have Masters in Science MSc in your desired stream .
Second step would be to do Bed i.e. Bachelor of Education course and then after successfully completion of B.Ed you need to give the entrance exam called as NET i.e. NATIONAL ELIGIBILITY TEST and then you will be a professor .
If you don't wanna give NET you should opt for a PHd degree and then apply for professor job.
Hope I made myself clear .
Thank you